This interactive world map highlights the ten countries with the highest CO2 emissions, coloring them green and labeling each with its name. Hovering over a highlighted country displays its emission value in million metric tons. The visualization uses a Natural Earth projection via `d3.geoNaturalEarth1` and renders country boundaries with `d3.geoPath`, pulling geographic data from the visionscarto-world-atlas TopoJSON file, which is converted with `topojson-client`. Country names and values are positioned using `d3.geoCentroid`.